Process and device for transformation of electric currents



ay 3, 1932- J. DlEUX 1,856,910

CE FOR TRANSFORMATION OF ELECTRIC CURRENTS PROCESS AND DEVI 2 Sheets-Sheet 1 Filed Jan. 8. 1950 May 3, 1932; J. DlEUX PROCESS AND DEVICE FOR TRANSFORMATIQN OF ELECTRIC CURRENTS File d Jan. 8, 1950 2 Sheets-Sheet 2 Patented May 3, 1932 JEAN DIEUX, 0F PARIS, FRANCE PROCESS AND DEVICE FOR TRANSFORMATION ELECTRIC CURRENTS Application filed January 8, 1930, Serial No. 419,255, and in France April 18, 1929.'

The object of my invention is the recording of sounds on a surface such as that of a disk whilst imparting to the said surface a velocity considerably less than the speed usually attained by this surface for reproducing sounds. The speed thus reduced enables the engraving stylus to reproduce all the delicacies of the sounds to be recorded.

. The invention also has for its object the construction of a matrix which in turn can be used to impress other disks so that needle scratch or surface noises are absent when said discs are used for reproduction.

The present invention relates to a special sound recording process which enables the attainment of the aforesaid objects. This process is an improvement made in the special processes and devices for analysis and synthesis of modulated or vibrated currents with pol grid and polyplate lamps.

The ini proved processes and devices of the invention consist essentially in the characteristic features given in the following description and particularly in the accompanying claims.

Arrangements, according to the invention, are shown by way of example, in the accompanying drawings; wherein Fig. 1 is a diagrammatic general view of ne arrangement according to the invention;

Fig. 2 is a diagram showing the method of working the disk holder plates fitted in this arrangement.

Fig. 3 is a diagram showing the electric connections of the arrangement, shown in Figs. 1 and 2.

Fi 4 represents the arrangement of Figs. 1 an 2 wherein a loud speaker takes the place of the engraving stylus.

Figs. 5 and 6 are devices to analyze sounds and obtain surfaces D D which are utilized in the devices of Figs. 1, 2 and 3.

The sounds emitted by the source of sound are collected by the microphone U (Fig. 5) and transformed into vibrated or modulated currents; the said currents being amplified in two amplifiers AE and AE or in an amplifier like that of the previous application, comconnected with prisinga single grid surface the microphone and two plate circuits each connected with an en graving stylus S S each of the said styli separately making an imprint on plate are driven at low r tively, different to ates of speed V constant in a known ratio Fig. 6 is a modi fied form of this Inent wherein two microphones U and utilized instead plifiers AE AE each other by the V V of plates D D in a known ratio The plates D D will be different one will have been recor speed. It will not on an ordinary ma sary to make them and besides each pl not, even when run reproduce the origi arrange- D or D Plates D D 2 respeceach other and remaining U are of one and two separate amworking two engraving condition that the inations U AE speeds remain constant and obtained by this process from the other as they ded at different rates of be possible to utilize them chine as it would be necesrotate at a very slow speed ate taken separately caning at its recording speed, nal sound, as it only reproduces an analytic part of the said sound.

These plates D the arrangement show is the object of the invention.

These plates D porting tables P D are P2 (Fig. 2 and an placed on two sup will then be utilized in n in Figs. 1 and 2 which ven by a motor M at speeds V V very nearly the same as the recording speeds V strictly constant and r ratio Rotation at speeds V?, V such tha can be obtained from a si gearing for examp 1e) indicated by E emaining in the same v 2 but ngle motor M by (bevel and E and each having a perfectly controllable reducing ratio.

The styli S S placed on the disks D D record separately the analytized musical compositions; the vibrated or modulated currents produced in the reproducers L L carrying the styli S S being impressed on the grid circuits of an amplifying valve V (Fig. 3) of the type described in the aforesaid application.

The valve has several grids G G ,.G ,G*, a single filament F and a single plate P. The circuit of the reproducer L is connectedwith grids G G*, whereas the circuit of the reproducer L is connected w'ith'the' grids G G through a transformer T. The filament circuit is provided with a switch Zm by means ofwhich one or other of the poles of the filament can be connected with a movable point pm on the secondary circuit of the transformer T and also with a potentiometer Pt also connected with the grids G G of the amplifying valve V The amplified synthetic currents produced in the single plate circuit of the amplifying lamp are received in an ordinary recording apparatus comprising an engravlng stylus Se connected at R with the plate circuit of the amplifying valve This engraving stylus will give an imprint on a final disk G, revolving with a speed V also reduced.

As the speeds V' V can differ slightly from V V it will be necessary to control slightly the speed V of disc G for recording on the disk to be regular with the speed of reproduction.

7 Instead of two intermediary surfaces D D and an amplifier with two plates for the analysis and four grids. for synthesis, it'is possible to have three or four intermediary surfaces and amplifying valves comprising a double number of grids or the same number of plates.

The chief advantages of this improved process are as follows (a) The recording surfaces D D in the recording room move with a much smaller linear speed than usual. The engravings in the groove, produced by the engraving stylus, will be less close together and it will be possible to record very complex variations of sound, viz., to obtain much greater precision and fidelity in reproduction of the sounds on the disks D D I (b) The surfaces D D being driven at different but constant speeds, each of which has its quality and influence on the sound frequencies, it is easy to make corrections, rectifications, artificial echo productions and all modifications of the sounds in question, by acting on the intermediary electric amplifying circuits for recording, whether primary 'or secondary. Employment of similar and synchronized speeds would give much poorer results. 7

(0) Disks D D placed on the tables P P of the synthesis apparatus will be endowed with movements of rotation at low rates of speed and all the recorded vibrations will be transmitted to the synthesis amplifier and as the final disk G also rotates at a reduced speed, all the delicacies will be integrally recorded on this said plate. The physical, chemical or luminous work of engraving will thus have great precision. As the engraving stylus Se works with practically inaudible frequencies, the particular "frequency of the engraving tool has no influence on the final soundand this advantage will be had both'forengraving the auxiliary disks D D and for the engraving of the final disk G. On the other hand,-it is known that parasitic recording noises clonstitute in the actual noise known as surface noise a much greater fraction than-the friction of the reproducing apparatus on the sound generating surface, a friction, the vibration period of which can be removed from the audible scale by a suitable choiceof the material acting as a support for recording. The final surfaces thus obtained are free from congenital surface noise, and good results only depend on the reproducing apparatus.

I claim.

1. The process of recording and reproducing sounds consisting in collecting the audible vibrations of a "source of sound, transforming these audible vibrations into modulated vibrated currents, analyzing these currents, *amplifying'the analytic currents, fixing them by engraving on two surfaces moving with different speeds but remaining at a constant ratio, synthetizing the vibrated modulated currents reproduced by saidsurfaces, and transforming the vibrated modulated current of the synthesisinto mechanical vibrations.

2. In an arrangement forcarrying outthe process as specified in claim -1 for-recording sounds by an intermediary surface, two auxiliary disks moving at different speeds (V, V but remaining at a constant ratio electric reproducers cooperating with said auxiliary disks, a multi grid and monoplate amplifier, an engraving stylus, a disk'to be engraved by said stylus, electric means connecting each reproducer to a grid circuit of said amplifier, and electric means connecting the plate circuit of said amplifier to said engraving stylus.

"3. In an arrangement forcarrying outthe process for recording-soundsby an'intermediary surface,as specified in claim l, two auxiliary disks, means-for imparting to said disks difierent speeds, electric reproducers cooperating with said disks, a multigrid and imprinted by said styli,

monoplate amplifier, an engraving stylus, a disk to be engraved by said stylus, electric means connecting each of said reproducers to a grid circuit of said amplifier, and electric means connecting the plate circuit of said amplifier to said engraving stylus.

In an arrangement for carrying out the process of recording sounds by an intermediary surface, as specified in claim 1, a disk to be engraved, auxiliary disks moving at difierent speeds, (V V but remaining at a definite constant ratio a multigrid and monoplate amplifier, an engraving stylus for making an imprint on said disk to be engraved, electric reproducers cooperating With said auxiliary disks, electric means connecting each of said reproducers to a grid circuit of said amplifier, and electrio means connecting the plate circuit of said amplifier to said engraving stylus.

5. In an arrangement for carrying out the process for recording sounds on an intermediary surface as specified in claim 1, a disk to be engraved, auzn'liary disks, means imparting to said auxiliary disks difi'erent speeds (V V but remaining at a definite constant ratio termediary surface, a microphone, a monogrid and polyplate amplifier, intermediary engraving styli, intermediary disks imprinted by said engraving styli, means for imparting movement to said disks at diiferent speeds (V V remaining at a constant definite ratio electric means connecting said microphone to the grid circuit of said polyplate amplifier, and electric means connecting each plate circuit of said polyplate amplifier to an intermediary engraving stylus.

7. In an arrangement for carrying out the process for recording sounds on intermediary surfaces, as specified in claim 1, a microphone, a monogrid and polyplate amplifier, intermediary engraving styli, auxiliary disks means imparting to said auxiliary disks movement at different speeds (V V' remaining at a definite constant ratio specification.

JEAN DIEUX. 

